New to G body's. Need wheel/tire help.

[BlackCatBuick]

So I recently bought a 79 Regal roller for $300 and I'm hoping I can make her great again. The wheels on it now are all thin rally wheels and I need to have it at least LOOK half decent. I want to do Cragar soft 8s all around, but I'm afraid to order the wheels in case I make a miscalculation. I'm wanting 16x8 in the back with 275s and 15x8 in the front with 245s. From other forums that I've read, you want no more than 4" back spacing. Does putting a 1 inch spacer on say a 4 inch bs wheel make it a 3 inch total backspace? And if it indeed does, will 16x8s with 275s and this 3" total backspace work fine? How about the front with 15x8s with 245s? What backspace should I use for those if they're doable? I don't know what height I should go with the tires, either, I'm just trying to get a satisfying (static) stance haha. Any input will be appreciated, as the only types of cars I know well are fox bodies

 

[BlackCatBuick]

So I recently bought a 79 Regal roller for $300 and I'm hoping I can make her great again. The wheels on it now are all thin rally wheels and I need to have it at least LOOK half decent. I want to do Cragar soft 8s all around, but I'm afraid to order the wheels in case I make a miscalculation. I'm wanting 16x8 in the back with 275s and 15x8 in the front with 245s. From other forums that I've read, you want no more than 4" back spacing. Does putting a 1 inch spacer on say a 4 inch bs wheel make it a 3 inch total backspace? And if it indeed does, will 16x8s with 275s and this 3" total backspace work fine? How about the front with 15x8s with 245s? What backspace should I use for those if they're doable? I don't know what height I should go with the tires, either, I'm just trying to get a satisfying (static) stance haha. Any input will be appreciated, as the only types of cars I know well are fox bodies

Reeeeally need some input here guys. I know theres a guide for this problem but i still cant tell for certain what i should buy from that information alone

 

[Qdub24]

16" wheels have a limited tire selection; I'd rather use 15x8 (235/60/15) front and 15x10 (275/60/15) rear. Why would you use a spacer with 4" backspace wheels. They should fit perfectly.